Almost 10,000 small tremors in the past three months.
“The regional government of the Spanish Canary Island of El Hierro has issued a volcanic eruption alert following almost 10,000 small tremors recorded in the past three months,” says this article on yahoo.com.
The island was shaken late yesterday by a 4.3-magnitude quake.
As with all of the Canary Islands, El Hierro was formed by volcanic activity. El Hierro has some 500 volcanic cones.
Thanks to John Reno for this link